aboutsummaryrefslogtreecommitdiffstats
path: root/src/decoder/DecoderAPI.cxx
blob: 3d45cb3252818383932dc7feb02ba2421c845ca2 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
/*
 * Copyright (C) 2003-2014 The Music Player Daemon Project
 * http://www.musicpd.org
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include "config.h"
#include "DecoderAPI.hxx"
#include "DecoderError.hxx"
#include "pcm/PcmConvert.hxx"
#include "AudioConfig.hxx"
#include "ReplayGainConfig.hxx"
#include "MusicChunk.hxx"
#include "MusicBuffer.hxx"
#include "MusicPipe.hxx"
#include "DecoderControl.hxx"
#include "DecoderInternal.hxx"
#include "DetachedSong.hxx"
#include "input/InputStream.hxx"
#include "util/Error.hxx"
#include "util/ConstBuffer.hxx"
#include "Log.hxx"

#include <assert.h>
#include <string.h>
#include <math.h>

void
decoder_initialized(Decoder &decoder,
		    const AudioFormat audio_format,
		    bool seekable, SignedSongTime duration)
{
	DecoderControl &dc = decoder.dc;
	struct audio_format_string af_string;

	assert(dc.state == DecoderState::START);
	assert(dc.pipe != nullptr);
	assert(decoder.convert == nullptr);
	assert(decoder.stream_tag == nullptr);
	assert(decoder.decoder_tag == nullptr);
	assert(!decoder.seeking);
	assert(audio_format.IsDefined());
	assert(audio_format.IsValid());

	dc.in_audio_format = audio_format;
	dc.out_audio_format = getOutputAudioFormat(audio_format);

	dc.seekable = seekable;
	dc.total_time = duration;

	FormatDebug(decoder_domain, "audio_format=%s, seekable=%s",
		    audio_format_to_string(dc.in_audio_format, &af_string),
		    seekable ? "true" : "false");

	if (dc.in_audio_format != dc.out_audio_format) {
		FormatDebug(decoder_domain, "converting to %s",
			    audio_format_to_string(dc.out_audio_format,
						   &af_string));

		decoder.convert = new PcmConvert();

		Error error;
		if (!decoder.convert->Open(dc.in_audio_format,
					   dc.out_audio_format,
					   error))
			decoder.error = std::move(error);
	}

	dc.Lock();
	dc.state = DecoderState::DECODE;
	dc.client_cond.signal();
	dc.Unlock();
}

/**
 * Checks if we need an "initial seek".  If so, then the initial seek
 * is prepared, and the function returns true.
 */
gcc_pure
static bool
decoder_prepare_initial_seek(Decoder &decoder)
{
	const DecoderControl &dc = decoder.dc;
	assert(dc.pipe != nullptr);

	if (dc.state != DecoderState::DECODE)
		/* wait until the decoder has finished initialisation
		   (reading file headers etc.) before emitting the
		   virtual "SEEK" command */
		return false;

	if (decoder.initial_seek_running)
		/* initial seek has already begun - override any other
		   command */
		return true;

	if (decoder.initial_seek_pending) {
		if (!dc.seekable) {
			/* seeking is not possible */
			decoder.initial_seek_pending = false;
			return false;
		}

		if (dc.command == DecoderCommand::NONE) {
			/* begin initial seek */

			decoder.initial_seek_pending = false;
			decoder.initial_seek_running = true;
			return true;
		}

		/* skip initial seek when there's another command
		   (e.g. STOP) */

		decoder.initial_seek_pending = false;
	}

	return false;
}

/**
 * Returns the current decoder command.  May return a "virtual"
 * synthesized command, e.g. to seek to the beginning of the CUE
 * track.
 */
gcc_pure
static DecoderCommand
decoder_get_virtual_command(Decoder &decoder)
{
	if (decoder.error.IsDefined())
		/* an error has occurred: stop the decoder plugin */
		return DecoderCommand::STOP;

	const DecoderControl &dc = decoder.dc;
	assert(dc.pipe != nullptr);

	if (decoder_prepare_initial_seek(decoder))
		return DecoderCommand::SEEK;

	return dc.command;
}

DecoderCommand
decoder_get_command(Decoder &decoder)
{
	return decoder_get_virtual_command(decoder);
}

void
decoder_command_finished(Decoder &decoder)
{
	DecoderControl &dc = decoder.dc;

	dc.Lock();

	assert(dc.command != DecoderCommand::NONE ||
	       decoder.initial_seek_running);
	assert(dc.command != DecoderCommand::SEEK ||
	       decoder.initial_seek_running ||
	       dc.seek_error || decoder.seeking);
	assert(dc.pipe != nullptr);

	if (decoder.initial_seek_running) {
		assert(!decoder.seeking);
		assert(decoder.chunk == nullptr);
		assert(dc.pipe->IsEmpty());

		decoder.initial_seek_running = false;
		decoder.timestamp = dc.start_time.ToDoubleS();
		dc.Unlock();
		return;
	}

	if (decoder.seeking) {
		decoder.seeking = false;

		/* delete frames from the old song position */

		if (decoder.chunk != nullptr) {
			dc.buffer->Return(decoder.chunk);
			decoder.chunk = nullptr;
		}

		dc.pipe->Clear(*dc.buffer);

		decoder.timestamp = dc.seek_time.ToDoubleS();
	}

	dc.command = DecoderCommand::NONE;
	dc.client_cond.signal();
	dc.Unlock();
}

SongTime
decoder_seek_time(Decoder &decoder)
{
	const DecoderControl &dc = decoder.dc;

	assert(dc.pipe != nullptr);

	if (decoder.initial_seek_running)
		return dc.start_time;

	assert(dc.command == DecoderCommand::SEEK);

	decoder.seeking = true;

	return dc.seek_time;
}

uint64_t
decoder_seek_where_frame(Decoder &decoder)
{
	const DecoderControl &dc = decoder.dc;

	return decoder_seek_time(decoder).ToScale<uint64_t>(dc.in_audio_format.sample_rate);
}

void decoder_seek_error(Decoder & decoder)
{
	DecoderControl &dc = decoder.dc;

	assert(dc.pipe != nullptr);

	if (decoder.initial_seek_running) {
		/* d'oh, we can't seek to the sub-song start position,
		   what now? - no idea, ignoring the problem for now. */
		decoder.initial_seek_running = false;
		return;
	}

	assert(dc.command == DecoderCommand::SEEK);

	dc.seek_error = true;
	decoder.seeking = false;

	decoder_command_finished(decoder);
}

InputStream *
decoder_open_uri(Decoder &decoder, const char *uri, Error &error)
{
	assert(decoder.dc.state == DecoderState::START ||
	       decoder.dc.state == DecoderState::DECODE);

	DecoderControl &dc = decoder.dc;
	Mutex &mutex = dc.mutex;
	Cond &cond = dc.cond;

	InputStream *is = InputStream::Open(uri, mutex, cond, error);
	if (is == nullptr)
		return nullptr;

	mutex.lock();
	while (true) {
		is->Update();
		if (is->IsReady()) {
			mutex.unlock();
			return is;
		}

		if (dc.command == DecoderCommand::STOP) {
			mutex.unlock();
			delete is;
			return nullptr;
		}

		cond.wait(mutex);
	}
}

/**
 * Should be read operation be cancelled?  That is the case when the
 * player thread has sent a command such as "STOP".
 */
gcc_pure
static inline bool
decoder_check_cancel_read(const Decoder *decoder)
{
	if (decoder == nullptr)
		return false;

	const DecoderControl &dc = decoder->dc;
	if (dc.command == DecoderCommand::NONE)
		return false;

	/* ignore the SEEK command during initialization, the plugin
	   should handle that after it has initialized successfully */
	if (dc.command == DecoderCommand::SEEK &&
	    (dc.state == DecoderState::START || decoder->seeking))
		return false;

	return true;
}

size_t
decoder_read(Decoder *decoder,
	     InputStream &is,
	     void *buffer, size_t length)
{
	/* XXX don't allow decoder==nullptr */

	assert(decoder == nullptr ||
	       decoder->dc.state == DecoderState::START ||
	       decoder->dc.state == DecoderState::DECODE);
	assert(buffer != nullptr);

	if (length == 0)
		return 0;

	is.Lock();

	while (true) {
		if (decoder_check_cancel_read(decoder)) {
			is.Unlock();
			return 0;
		}

		if (is.IsAvailable())
			break;

		is.cond.wait(is.mutex);
	}

	Error error;
	size_t nbytes = is.Read(buffer, length, error);
	assert(nbytes == 0 || !error.IsDefined());
	assert(nbytes > 0 || error.IsDefined() || is.IsEOF());

	is.Unlock();

	if (gcc_unlikely(nbytes == 0 && error.IsDefined()))
		LogError(error);

	return nbytes;
}

bool
decoder_read_full(Decoder *decoder, InputStream &is,
		  void *_buffer, size_t size)
{
	uint8_t *buffer = (uint8_t *)_buffer;

	while (size > 0) {
		size_t nbytes = decoder_read(decoder, is, buffer, size);
		if (nbytes == 0)
			return false;

		buffer += nbytes;
		size -= nbytes;
	}

	return true;
}

bool
decoder_skip(Decoder *decoder, InputStream &is, size_t size)
{
	while (size > 0) {
		char buffer[1024];
		size_t nbytes = decoder_read(decoder, is, buffer,
					     std::min(sizeof(buffer), size));
		if (nbytes == 0)
			return false;

		size -= nbytes;
	}

	return true;
}

void
decoder_timestamp(Decoder &decoder, double t)
{
	assert(t >= 0);

	decoder.timestamp = t;
}

/**
 * Sends a #tag as-is to the music pipe.  Flushes the current chunk
 * (decoder.chunk) if there is one.
 */
static DecoderCommand
do_send_tag(Decoder &decoder, const Tag &tag)
{
	MusicChunk *chunk;

	if (decoder.chunk != nullptr) {
		/* there is a partial chunk - flush it, we want the
		   tag in a new chunk */
		decoder.FlushChunk();
	}

	assert(decoder.chunk == nullptr);

	chunk = decoder.GetChunk();
	if (chunk == nullptr) {
		assert(decoder.dc.command != DecoderCommand::NONE);
		return decoder.dc.command;
	}

	chunk->tag = new Tag(tag);
	return DecoderCommand::NONE;
}

static bool
update_stream_tag(Decoder &decoder, InputStream *is)
{
	Tag *tag;

	tag = is != nullptr
		? is->LockReadTag()
		: nullptr;
	if (tag == nullptr) {
		tag = decoder.song_tag;
		if (tag == nullptr)
			return false;

		/* no stream tag present - submit the song tag
		   instead */
		decoder.song_tag = nullptr;
	}

	delete decoder.stream_tag;
	decoder.stream_tag = tag;
	return true;
}

DecoderCommand
decoder_data(Decoder &decoder,
	     InputStream *is,
	     const void *data, size_t length,
	     uint16_t kbit_rate)
{
	DecoderControl &dc = decoder.dc;
	DecoderCommand cmd;

	assert(dc.state == DecoderState::DECODE);
	assert(dc.pipe != nullptr);
	assert(length % dc.in_audio_format.GetFrameSize() == 0);

	dc.Lock();
	cmd = decoder_get_virtual_command(decoder);
	dc.Unlock();

	if (cmd == DecoderCommand::STOP || cmd == DecoderCommand::SEEK ||
	    length == 0)
		return cmd;

	/* send stream tags */

	if (update_stream_tag(decoder, is)) {
		if (decoder.decoder_tag != nullptr) {
			/* merge with tag from decoder plugin */
			Tag *tag = Tag::Merge(*decoder.decoder_tag,
					      *decoder.stream_tag);
			cmd = do_send_tag(decoder, *tag);
			delete tag;
		} else
			/* send only the stream tag */
			cmd = do_send_tag(decoder, *decoder.stream_tag);

		if (cmd != DecoderCommand::NONE)
			return cmd;
	}

	if (decoder.convert != nullptr) {
		assert(dc.in_audio_format != dc.out_audio_format);

		Error error;
		auto result = decoder.convert->Convert({data, length},
						       error);
		if (data == nullptr) {
			/* the PCM conversion has failed - stop
			   playback, since we have no better way to
			   bail out */
			LogError(error);
			return DecoderCommand::STOP;
		}

		data = result.data;
		length = result.size;
	} else {
		assert(dc.in_audio_format == dc.out_audio_format);
	}

	while (length > 0) {
		MusicChunk *chunk;
		bool full;

		chunk = decoder.GetChunk();
		if (chunk == nullptr) {
			assert(dc.command != DecoderCommand::NONE);
			return dc.command;
		}

		const auto dest =
			chunk->Write(dc.out_audio_format,
				     SongTime::FromS(decoder.timestamp) -
				     dc.song->GetStartTime(),
				     kbit_rate);
		if (dest.IsNull()) {
			/* the chunk is full, flush it */
			decoder.FlushChunk();
			continue;
		}

		size_t nbytes = dest.size;
		assert(nbytes > 0);

		if (nbytes > length)
			nbytes = length;

		/* copy the buffer */

		memcpy(dest.data, data, nbytes);

		/* expand the music pipe chunk */

		full = chunk->Expand(dc.out_audio_format, nbytes);
		if (full) {
			/* the chunk is full, flush it */
			decoder.FlushChunk();
		}

		data = (const uint8_t *)data + nbytes;
		length -= nbytes;

		decoder.timestamp += (double)nbytes /
			dc.out_audio_format.GetTimeToSize();

		if (dc.end_time.IsPositive() &&
		    decoder.timestamp >= dc.end_time.ToDoubleS())
			/* the end of this range has been reached:
			   stop decoding */
			return DecoderCommand::STOP;
	}

	return DecoderCommand::NONE;
}

DecoderCommand
decoder_tag(Decoder &decoder, InputStream *is,
	    Tag &&tag)
{
	gcc_unused const DecoderControl &dc = decoder.dc;
	DecoderCommand cmd;

	assert(dc.state == DecoderState::DECODE);
	assert(dc.pipe != nullptr);

	/* save the tag */

	delete decoder.decoder_tag;
	decoder.decoder_tag = new Tag(tag);

	/* check for a new stream tag */

	update_stream_tag(decoder, is);

	/* check if we're seeking */

	if (decoder_prepare_initial_seek(decoder))
		/* during initial seek, no music chunk must be created
		   until seeking is finished; skip the rest of the
		   function here */
		return DecoderCommand::SEEK;

	/* send tag to music pipe */

	if (decoder.stream_tag != nullptr) {
		/* merge with tag from input stream */
		Tag *merged;

		merged = Tag::Merge(*decoder.stream_tag,
				    *decoder.decoder_tag);
		cmd = do_send_tag(decoder, *merged);
		delete merged;
	} else
		/* send only the decoder tag */
		cmd = do_send_tag(decoder, *decoder.decoder_tag);

	return cmd;
}

void
decoder_replay_gain(Decoder &decoder,
		    const ReplayGainInfo *replay_gain_info)
{
	if (replay_gain_info != nullptr) {
		static unsigned serial;
		if (++serial == 0)
			serial = 1;

		if (REPLAY_GAIN_OFF != replay_gain_mode) {
			ReplayGainMode rgm = replay_gain_mode;
			if (rgm != REPLAY_GAIN_ALBUM)
				rgm = REPLAY_GAIN_TRACK;

			const auto &tuple = replay_gain_info->tuples[rgm];
			const auto scale =
				tuple.CalculateScale(replay_gain_preamp,
						     replay_gain_missing_preamp,
						     replay_gain_limit);
			decoder.dc.replay_gain_db = 20.0 * log10f(scale);
		}

		decoder.replay_gain_info = *replay_gain_info;
		decoder.replay_gain_serial = serial;

		if (decoder.chunk != nullptr) {
			/* flush the current chunk because the new
			   replay gain values affect the following
			   samples */
			decoder.FlushChunk();
		}
	} else
		decoder.replay_gain_serial = 0;
}

void
decoder_mixramp(Decoder &decoder, MixRampInfo &&mix_ramp)
{
	DecoderControl &dc = decoder.dc;

	dc.SetMixRamp(std::move(mix_ramp));
}